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rocket_doge_'s questions

Martin Hope
rocket_doge_
Asked: 2017-12-20 06:59:49 +0800 CST
  • 1

I have been searching the internet about this for a while and did not seem to be able to find a solution:
Is it possible to configure Bind9 in a way that it returns a default ("The page you are looking for does not exist"-kind-of) IP when it receives a request to a nonexistant domain?

For example asdfsdfsdafsdf.com (or any not registered domain) would not return NXDOMAIN, but rather a default IP Address redirecting to this "Address not found"-page.

domain-name-system
Martin Hope
rocket_doge_
Asked: 2017-05-26 11:51:03 +0800 CST
  • 0

I am having the following problem: I am running a Debian server for about a year now, and I have never quite got emails to be delivered correctly. They keep getting caught in Googles Spam filters, Outlook doesn't even seem to bother and deliver them at all (not even to the spam folder, the logs say "250: Queued mail for delivery" though). By now I am really desperate, I have tried everything. SPF, DKIM and DMARC are set up and working correctly, as well as rDNS, TLS Encryption, and so on. I really don't know what I am doing wrong. The content of the test emails I send varies from just "Test Email, please ignore" (most likely to be marked as spam) to excerpts from essays or other (successfully delivered mail, sent from my gmail account). Mail reputation testers like mail-tester.com or mxtoolbox reward me with a 100% score and no blacklist entries whatsoever. This is an example header from an email gmail has marked as spam:

Delivered-To: [email protected]
Received: by 10.13.219.204 with SMTP id d195csp864184ywe;
    Thu, 25 May 2017 12:21:05 -0700 (PDT)
X-Received: by 10.223.168.120 with SMTP id l111mr23297935wrc.137.1495740065010;
    Thu, 25 May 2017 12:21:05 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1495740064; cv=none;
    d=google.com; s=arc-20160816;
    b=qfY69gpmb0GQn3ZGvSEJyIxi+zr2DbvUyY993tWQep9z+ZN0vEIzWjXyofJCBkSWH2
     sNutCeHIiMvfaloacvcMdWC5zoE/Pbf0TpEdNP+dnd+wXI112LXpVE+A8zA9MHoO0oEY
     CC7hfCzDRNP0IF6b//1euhzlJvrhuj99wWDBTcvKd1x/CWQJW1qNq1sMERmzYiQ1wHDM
     rnHbvkG385LihogIsdXhSZ4A93HCogl5ERUtr3+PT717pilkNUXZS4Hp6l8XFKXCOOnS
     /1oFR0xBY5FeZcJ6Vt/+C2H/qB7NtYNc0G3IVkTa6nmaxtihQqZHZ+e8NfVJX7BBWxn1
     nl/Q==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
    h=content-language:content-transfer-encoding:mime-version:user-agent
     :date:message-id:subject:from:to:dkim-signature:dkim-signature
     :arc-authentication-results;
    bh=acCgJp9ry6elq8fVTxHxfBFnaouI4MAk66UPTSH2BW4=;
    b=Of8iF8mxuMrJZNYdVS+ni786ZuZNV7rnyLmz/bbu8O1StdBos4vAG8v2LaC3OFBvua
     OxD0EHbxbsMoIveVMF9pHXHI4bN5YD53t+x7hv9SYqCdCmyG1HCcMFFt6otL5PvSPVwK
     Q+beOiUjrp3TJ7btoSAWaPCdKSR41J39zTGrpowU/NYISQaUc5mt8Q4e2MHF/l6n9NRd
     bNvtXIqPUVAOvzDeV2YpNAOquFa33gSsXB3PvcsE6z1UkjPR7TSj0/W5E6uUMPV3BVy4
     tMOcjaEiuEY5a6qC+AxbaG5PUhWaCKhAJnai/Av0ypb05hikXnbECgbbWcm8r3PLuhyS
     TJpQ==
ARC-Authentication-Results: i=1; mx.google.com;
   dkim=pass [email protected];
   dkim=pass [email protected];
   spf=pass (google.com: domain of [email protected] designates serverip as permitted sender) [email protected];
   dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=mydomain.de
Return-Path: <[email protected]>
Received: from mail.mydomain.de (mail.mydomain.de. [serverip])
    by mx.google.com with ESMTPS id z35si25488994wrb.20.2017.05.25.12.21.04
    for <[email protected]>
    (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
    Thu, 25 May 2017 12:21:04 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates serverip as permitted sender) client-ip=serverip;
Authentication-Results: mx.google.com;
   dkim=pass [email protected];
   dkim=pass [email protected];
   spf=pass (google.com: domain of [email protected] designates serverip as permitted sender) [email protected];
   dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=mydomain.de
Received: from localhost (mydomain.de [127.0.0.1]) by mail.mydomain.de (Postfix) with ESMTP id 476A7CA2F25 for <[email protected]>; Thu, 25 May 2017 21:21:04 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mydomain.de; s=mail; t=1495740064; bh=T6eVPXuCwCbaUltsFhuNXSvdEdHR+yNp0E88tVlLWVo=; h=To:From:Subject:Date:From; b=nG0IbgoWQ6jQGqZSE3YWPanvRkpLqKF/H4wIOMsQs3RBfxbFtJ1KKzFSgyvimgYTY
 PEz+43mX37Uce2QqGKbKnRTPObHYII6y/pFXHivSrAaAnQ87bpMT3c4WMPAaLOeWiQ
 kQnZb/UDNTrPlDVTmm/KcDP3LykKqdrPGMwOMBUA=
X-Virus-Scanned: Debian amavisd-new at mail.mydomain.de
Received: from mail.mydomain.de ([127.0.0.1]) by localhost (mydomain.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3r4vvA1sDSP5 for <[email protected]>; Thu, 25 May 2017 21:21:03 +0200 (CEST)
Received: from [192.168.10.194] (pD92B27.dip0.t-ipconnect.de [myip]) by mail.mydomain.de (Postfix) with ESMTPSA id 9B621CA2F0B for <[email protected]>; Thu, 25 May 2017 21:21:03 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mydomain.de; s=mail; t=1495740063; bh=T6eVPXuCwCbaUltsFhuNXSvdEdHR+yNp0E88tVlLWVo=; h=To:From:Subject:Date:From; b=aXQ1tHoCs3oj/Q3TyHZ6eNnpWaaFoeTFKwgBw6TrLSubj8SptLnTQ5A2Avme/nAUA
 uEHeONftJ1VpKRIdK1aebBfMnPdoh6V9Qu1HLN4CaQTGKXHncGP8apoYaKxa61uRK+
 yzVW+JIHcXsUBOez5MoJ4JP8sSag9F/3k1vllqlo=
To: [email protected]
From: Tim Fuchs <[email protected]>
Subject: <Email subject>
Message-ID: <[email protected]>
Date: Thu, 25 May 2017 21:21:03 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 
Thunderbird/52.1.1
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: en-US

<Email message>

I cannot see anything which would make the email go to spam, maybe one of you can help. It would be really great if i could finally get this resolved, as this has been bugging me for a really long time now...

Thank you very much for your help in advance ^.^

debian
Martin Hope
rocket_doge_
Asked: 2016-06-17 10:28:33 +0800 CST
  • 0

I am running a Debian 8 VPS for a couple of months now. I running several services, including a mailserver with Postfix and Dovecot. As far as I can tell, I have everything set up correctly. My IP is not blacklisted anywhere, the reputation is neutral. SPF, DKIM and DMARC are set up and working correctly. I am using TLS with a valid SSL certificate. I have set up an FQDN.

Tests like checktls, allaboutspam, mxtoolbox or mail-tester.com all return 0-1% spam probability and a 10/10 score.

Here are the Headers of mail sent by Thunderbird and the Owncloud webmailer:

Thunderbird: https://owncloud.fuchstim.de/s/TfLDXAFouQ9u7OW

Owncloud Webmailer: https://owncloud.fuchstim.de/s/hfd2euVbB6MjPZx

As you can see, SPF, DKIM and DMARC checks are passing. The mails are being marked as spam by Outlook / Hotmail as well.

What am I doing wrong?

If you need more detailed information about the configuration, please tell me (^^)

debian spam postfix email-server dovecot
Martin Hope
rocket_doge_
Asked: 2016-05-21 04:27:15 +0800 CST
  • 1

I have now spent some time researching, but I haven't found a working solution to the following problem:

I want to tunnel any requests on server 1, port x to server 2, port x. The port stays the same, I just want to tunnel any data being sent to server 1 on port x to server 2.

The connection would look like this:

Client > Server 1 >tunnel> Server 2

and reverse:

Server 2 >tunnel> Server1 > Client

Is that possible? If yes, how? The servers are both running Debian 8.

Please excuse me if this is a total noob question, but I am just getting started with servers and stuff.

Thanks ^^

debian proxy port-forwarding linux-networking tunnel